SLP or K&N?

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I have the K&N , I looked into both but the K&N one has a larger filter area which to me means it will allow more air in and this should give a greater performance gain but I recently read a article that was posted in this thread in the camaro forum http://www.automotiveforums.com/vbulletin/showthread.php?t=367559 . About the ability of high performance filters to take out dirt and I was shocked by the report. Anyway either are good systems and will give you greater performance.

John